Add configurable parameter for ES reload_connections

reload_connections set to true breaks our logging to ES
with SSL enabled.

https://github.com/uken/fluent-plugin-elasticsearch#reload_connections

Related-Prod: PROD-37064
Change-Id: Ic311c7cd09afcad55b3f5d0408197cd5d598ad24
diff --git a/README.rst b/README.rst
index ecc04cd..d20c539 100644
--- a/README.rst
+++ b/README.rst
@@ -82,6 +82,7 @@
                 port: 9200
                 buffer:
                   flush_thread_count: 8
+                reload_connections: false
           monitoring:
             worker: '0-2'
             filter: